Incandescent electric lamp



(No Model.)

C. R. ARNOLD. INGANDESGENT ELECTRIC LAMP.

No. 507,978. Patented Nov. '7, 1893.

ATTEST: f l /NVENTU/::

Croa'f R/,azvwll NNNNNNNNNNNNN c.

'UNITED STATES PATENT OEEICE.

CRAIG RITCHIE ARNOLD, OF SHARON HILL, PENNSYLVANIA.

INCNDESCENT ELECTRIC LAMP.

SPECIFICATION `forming part of Letters Patent No. 507,978, dated November 7, 1893.

Application iiled February 28, 1891. Serial No. 383,143. (No model.)

To all whom it may concern:

Beit known that I, CRAIG RITCHIE ARNOLD, a citizen of the United States, and a resident of Sharon Hill, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Incandescent Electric Lamps, of which the following is a specification.'

My invention relates to incandescent electric lamps, and its object is to prevent the dissipation of the light rays radiating from the lament toward the base of the lamp, to which end my invention consists in the details of constructionas will be hereinafter set forth and specified in the claim.

In the accompanyingdrawing,1have shown, in vertical section, a form of lamp containing my invention and comprising a support for the lamp wires in the nature of a stopper which fits into the neck of the lamp globe and which has the leading in wires sealed at the point of union between the stopper and globe, said stopper being silvered ou its interior-and tilledin With plaster of paris.

In the drawing:-.A, represents a globe or bulb of any ordinary, convenient or suitable construction; B, B, are the leading in wires of the lamp, and C, the luminous bridge or filament which may also be of any suitable or convenient form or material.

In order that the rays from the filament or bridge C, which radiate toward the neck of the lamp under the old constructions, are dissipated and lost, shall be utilized and thus add to the illuminating power of the lamp, I provide a glass bulb, stem, stopper or wiresupport, D, to which the leading in wires, B,

are secured by embedding them on itsexterior surface and' which is hermetically attached to the globe by fusing it to the upper edge thereof. The stopper isspherical at its lower portion, d, which projects into the interior of the globe, A, and has the said lower portion, d, formed as a reiiector preferably by coating the same on its interior at, d', with a Silvering solution such as is rwell known in the art of making mirrors. One way of-forming the lower reflecting surface, d', is as followsz-,I pour into the hollow glass stopper, D, a solution of nitrate of silver, add thereto a solution of bitartrate of potash until complete precipitation ensues and a sufficiently thick silvering coating has been applied to the interior of the stopper, D, to produce a good reflecting surface. I then pour off the mixture and ll in the stopper with plaster of paris or any material which, on drying, will protect the interior reflector coating.

What I claim as my invention is- In an incandescent electric lamp, the combination with the globe, of the hollow glass stopper D, having the leading in wires sealed between the stopper and neck, a reliector formed at d, on said stopper, and a filling of plaster of paris or similar material.

Signed at Chester, in the county of Delaware and State of Pennsylvania, this 3d day of December, A. D. 1890.

CRAIG RITCHIE ARNOLD.

Witnesses:

J. LENTZ GARRETT, JOHN GEARY. 

